Muffler.



' T. c. FORBES.

MUFFLER.

" APPLICATION FILED JULY 21. I909.

Patgnted June 7, 1910.

b TAO/27cm azr /l Mam/W UNITED STATES PATENT OFFICE.

THOMAS C. FORBES, OF LOS ANGELES, CALIFORNIA, ASSIGNOR TO LOS ANGELES ROTARY GAS ENGINE COMPANY, OF LOS ANGELES, CALIFORNIA, A CORPORATION OF CALIFORNIA.

MUFFLER.

Specification of Letters Patent.

Patented June 7, 1910.

To all whom it may comm:

Be it known that I, THOMA'S 0. Forums, a citizen of the United States, residing at Los Angeles, in the county of Los Angeles and State of California, have invented a new and useful Muffler, of which the following is a specification.

This invention relates to a mufiler adapted for internal combustion engines of the rotary type in which the cylinders bodily revolve and the main objects of the invention are to reduce the noise of exhaust as'much as possible and prevent back pressure in the cylinders.

Referring to the drawings: Figure 1 is a side elevation of an engine equipped with the mullier, part of the muiiler being in section. Fig. 2 is an enlarged cross section on line w--w of Fig. 1. Fig. 3 is an enlarged cross section on line w -m of Fig. 1.

The engine shown has five cylinders 1, which are mounted to rotate around a shaft 2.

3 designates the muffler, which comprises an. annular chamber consisting of an outer channel member 4, and an inner channel member 5, the flanges (i of which fit within the member at and'are secured by screws 7. The mutiler may be secured to the cylinders in any desired manner, as for example, by bolts 8 which pass through lugs 9 cast on the cylinders.

A series of partitions 10 divide the interior of the mufiler into a series of chambers 11, while a transverse partition 12 forms an inner chamber 13, and an outer chamber 14.

Each cylinder has exhaust passages 15 which open into the inner chamber 13 and the discharge end portions of the passages form an acute angle with the muttler so as to approximate the plane of movement of the mufiler, and they discharge in a direc-' tion opposite to the direction of movement of the muffler. The cylinders and muflier rotate in the direction indicated bythe arrow in Fig. 2 and as the tendency of the exhaust gas discharged into the mufiler is to lag behind the speed of the muliler a certain amount of suction is produced acting outwardly through the exhaust ports which facilitates the discharge of the exhaust gas therefrom.

The gas is discharged intothe chamber nearly parallel with the chamber produclng a rotary mot-ion of the gas past the port of the succeeding cylinder, thereby producing a suction effect in the succeeding cylinder, and preventing back flow of the gas thereinto, thus obviating contamination of the incoming charge in that cylinder.

The exhaust gas passes from the inner chamber 13 through ports 15 in the partition 12 into the chamber 14, the perforations 15' being numerous and distributed along the entire partition 12, so that the gas is split up and uniformly distributed. From the chamber 14 the gas passes through perforations 16 in the innermost partition 10, and thence through similar perforations in the succeeding partitions 10 traversing the several chambers 11. The perforations 16 of alternate partitions 10 are located near their larger diameter, while those of the intervening partitions are located near the inner diameter, thus causing the gas to weave back and forth making a lon circuit before it is discharged from the mu er. From the outer chamber 11, the gas issues to the atmosphere through a series of perforations 17. The bridge 18 which is formed between the passages 15 prevents the piston from striking the edge of the ports 15 which would result if a/ single large port were em ployed.

The partitions 10 are spaced apart by rings 18, while the outermost partition 10 is spaced; from the'outer wall 5 by the flanges 6 thereof.

What Iolaim is:

1. A mufller. for rotary engines comprisin a continuous annular chamber rotating wlth the engine and having a communication with the exhaustport of the cylinder, and having a'discharge opening. a

2. A mufiler for rotary i'engmes comprising an annular chamber rotating with the engine and having a series of openings in communication with the respective exhaust ports of the cylinders, and having a series of discharge openings. 3. A mufller for rotary engines comprising a continuous annular chamber rotating with the engine, means for discharging exhaust gas from a cylinder into the annular chamber in a direction opposed to the direo tion of rotation of the chamber, the chamber having a series of discharge, openings.

4. A mufller for rotary engines comprisries of discharge openings.

ing an annular chamber rotating with the engine,the wall between the annular chamber and a cylinder being provided with a curved passage for discharging the exhaust gas into the annular chamber in a direction opposed to the direction of rotation of the chamber, the chamber having a series of discharge openings.

5. A muiiler for rotary engines comprising an annular chamber rotating With the engine, the Wall between the annular chamber and a cylinder being provided with a pair of curved passages for discharging the exhaust gas into the annular cham er in a direction opposed to the direction of rotation of the chamber, the chamber having a series of discharge openings.

6. A mufiier for rotary engines comprising an annular chamber rotating with the engine and having communication with the exhaust port of a cylinder, a series of partitions in-the annular chamber, the partitions having ports, and the chamber having a se- 7. A muflier for rotary engines comprising an annular chamber rotating With the engine and having communication with the exhaust port of a cylinder, a series of ra- I dial partitions in the chamber, alternate partitions having ports near their outer circumference, intervening partitions having ports near their inner circumference, the

outermost chamber formed by the partitions having a series of discharge openings.

8. A mufiier for rotary engines comprising an annular chamber rotating with the engine and having communication with the exhaust port of a cylinder, a series of radial partitions in the chamber, alternate partitions having ports near their outer circumference, intervening partitions having ports near their inner circumference, the outer most chamber formed by the partitions having a series of discharge openings, and a circu ar partition at right angles to the radial partitlons and having a series of ports.

9. A muffler for rotary engines corn rising an annular chamber consisting 0 an inner channel member, and an outer member with flanges overlapping the inner member, a series of radial partitions in the chamber, rings spacing the partitions apart, the partitions having ports, the inner member being in communication with the exhaust port of a cylinder, the outermost chamber having discharge 0 enin s.

In testimony W ereo I have hereunto set In hand at Los Angeles, California, this 28th ay of June 1909.

THOMAS C. FORBES,

In presence of- G. T. HACKLEY, FRANK L. A. GRAHAM. 

